Improvement in combined knob-latch and lock



*t i" tici :I /tatvt @anni like. f

J. B. KE-LLEY, OF BRANDON, VERMONT.

Leners Parent No. 88,791, daad Apta-13, 1869.

IMPROVEMENT IN COIBEBINED KNOB-LATCH .AND LOCK The Schedule referred to in these Letters Patent and making part of the same.

To whom. it ma/y conce/m.-

Be it known that I, J. B. KELLEY, of Brandon, in the county of Rutland, in the State of Vermont, have invented certain new and useful Improvements in Locks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Similar letters of reference relate to the corresponding parts in the several figures.

The object of my invention consists in providing a combination lock and latch, which dispenses entirely with all kinds of springs, can be cast in separate pieces,

of iron or other cheap material, is extremelyI diiiicult to pick, and may be manufactured very cheaply.

In order that others skilled in the art may be enabled to make and useA my invention, I will proceed to describe its construction and operation.

I construct the box C, Figures l and 2, which is to contain the various parts, in the usual form, inserting therein, permanently, the pins a, b c.

The gravitating latch-bolt A, which serves as the lock-bolt and latch, is cast in the form shown in,Figure 3, having the shoulder d, lug m," and stop fr, cast thereon.

This latch-bolt A is suspended on the pin a, upon which it moves freely.

The lever L, which is to operate the latch-bolt A, is cast in the form shown in Figure 4, where the doorknob is represented as being attached. In figs. 1 and 2, the same is shown with the square hole through the large end, for the reception of the rod connecting the inside and outside knobs.

This lever L rotates upon the pinion serted in the box C.

The tumblers t t t are cast separately, having the vertical slot hand semicircular slot s. These are more plainly shown in Figm'e 5, where they are placed together, and show their relative positions when suspended on the pin b, each one, however, moving independently of the other.

These tumblers may be made of any length required,

n., which is inbut must correspond to the length of the guards on the key, Figure 6*.

The number of these tumblers may be increased or diminished, as desired, but must always correspond to the number of guards on the key.

To operate this lock as a latch, the tumblers are thrown back into the position shown in fig. 2, and, by its own weight, the latch A will take the position shown in iig. l, and is prevented from going too far by the v shoulder k and the stop fr. To unlatch it, turn the knob to the left, and the small'end of the lever L will press upon the` lug m, and throw the latch A into the position shown in Iig. 2; or, turn the knob to the right, and the lever L throws the latch back, by means of the stop i. The tumblers t t t are held in position, iig. 1, and the latch may be used freely, until it is desired to lock it. The key will then turn the tumblers to their position in g. l, and the latch-bolt A, which then becomes a lock-bolt, will be held fast by the tumblers, which cannot be forced back until the proper key shall raise each one, so that the pin c shall vmove through the slot s, to the position shown in fig. 2.

When locked, the pin c bein'g behindthe shoulderw 0f the tumblers, the bolt A cannot be forced back till the guards on the key raise all the tumblers sufficiently to pass over the pin c. The lock is thus hard to pick, because all the guards must be of the proper length to raise all the tumblers.

It will be observed-that this combined lock and latch is only applicable to doors, 85e., that maintain a vertical position.

Having thus described my improvement,

What I claim, and desire to secure by Letters Patent, is-

The combination and arrangement of the latch-bolt A, lever L, tumblers t t t, pins a b c, and box C, substantially as and for the purposes set forth.

. J. B. KELLEY.

Witnesses:

0. A. THOMAS, Guo. R. B orTUM. 

